Abstract

This paper demonstrates a high-energy, single-longitudinal-mode (SLM), actively ${Q}$-switched fiber laser based on the injection seeding technique. The large-mode-area double-cladding fiber is used as the gain medium to improve energy storage. Simultaneously, by using the linear electro-optic effect of the negative uniaxial crystal ($\beta {\text-} {{\rm BaB}_2}{{\rm O}_4}$, BBO), a matching frequency-shift-free ${Q}$-switch with high damage threshold and high extinction-ratio is designed. Before reaching the stimulated Brillouin scattering threshold, the SLM ${Q}$-switched pulses can be achieved with energy higher than 15 µJ over a wide range of repetition rates from 10 to 80 kHz, and the maximum output power reaches 1.2 W at the repetition rate of 80 kHz, which may be the highest output pulse energy for such a SLM ${Q}$-switched fiber laser so far, to our best knowledge.

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